Packing-ring.



. NITED STATES PATENT oFFioE.

To all whom it may concern.'

Be it known that I, EDWARD B. CAMPBELL, a citizen of the United States, residing in the city of St. Louis and State of Missouri, have invented a new and useful Packingling, of which the following is a specification.

This invention relates to packing rings of the type used in connection with reciprocating pistons, and it consists of an open ring of the elastic or expansion type adapted to encircle the istcn and be seated within a circumferential groove therein so as to eX- pand against the interior surface of the cylinder.

An object of the invention is to produceva packing ring comprising a resilient, open ring, the adjacent ends of which are provided with overlapping extensions w ich are received in corresponding recesses in the ring, thus forming a close connection which prevents the passage of the gas or steam,--or

the products of combustion, from one end of the piston to the Another object is to produce a resilient packing rinor of the open type, the annulus of which is su stantially rectangular in cross section and each end of which is provided with two noncommunicating notches or recesses and with two reduced extensions, the

extensions on one end of theopen ring being seated within the'notches or recesses on the opposite end thereof, so that when the ring j is seated on the piston and within the cylinder a substantially hermetic joint is formed.

In the accompanying drawings in which l have illustrated one embodiment of my invention, Figure 1 is a cross sectional view of a piston and a cylinder showing my improved packing ring in combination therewith. Fi 2 is a longitudinal sectional view of the cylinder showin the piston with the packing rings mounte thereon within the cylinder. Fi 3 is a pers ective view of the packing ring detached om the piston. Figs. 4 and 5 are detail views illustrating the formation of the overlapping end parts of the ring. j, j

The reciprocating piston 1n is of usual construction and operates within thelusual.

cylinder 2, power being transmitted from the piston by meansof a piston rod 3. The piston rod 3 is connected to the piston by well known pivotconnection 4.

As usual, a number of circumferential Specification of Letters Patent.

Application tiled July 6, 1914. Serial No. 849,329.

Patented Mar. 23, 1915.

grooves or channels are formed in the periphery of the piston l and within these grooves or channels the packing rings are mounted, The construction and arrangenient of the packing rings are clearly illustrated in Figs. 3, 4 and 5, inwhich it will be seen that each ring consists of an open ring member 5, the annulus of which is substantially rectangular in cross section and which is adapted to be received in any of the circumferential grooves or channels formed in the piston.

Preferably each ring is originally cut from a cylinder having a diameter slightly in excess of the interior diameter of the-cylinder within which the ring is to operate so that the natural resiliency of the ring will cause it to expand to the full extent permitted by the cylinder within which it is operating, thus forming a very close and substantially hermetic connection.

One end of the ring is provided with a notch or recess at one of the outer corners thereof and with a similar notch or recess 7 at the inner corner diagonally opposite from the outer recess. 'The formation of the notches or recesses 6 and 7 leaves two projecting tongues or extensions 8, preferably forming connection ai: their adjacent corners, as indicated at 9 (Fig. 5) so that there is no communication between the notches or recesses 6 and 7. The adjacent end of the ring is also provided with a notch or recess l() of the same size as and adapted to receive the outer tongue or projection 8 on the adjacent end of the rin Also this end of the ring is provided with an inner notch or recess 11 which is of the same size yas and which is adapted to receive the inner As mentioned in describing the arrange- 'i D 105 ment of the recsses 6 and v7, it is preferposition upon the l able that' said recesses and the se arate tongues or projections be so forme there shall be no communication between the inner and o uter recesses, thus preventing the passage of any of the gas or steam from the explosion chamber in the cylinder. It is preferable that the tongues or projections 4` that shall overlap a distance considerably in excess of the greatest ex ansion of the ring when mounted within ec linder, so that there will always be a c ose conneln formed by the overlapping tongues thereby preventing the passage of the gas or steam. ether the ring be roduced from a sin-4 gle member in whic the overlap ing tongues or projections are formed, or rom rigidly or integrally united rings, is immaterial since the resulting structure is substantially the same. Therefore, I do not restrict myself to an specific manner of producing the ring. t will be understood that I contemplate such variations as `may be found necessary in order to produce the ring most satisfactorily under varying conditions y and that I do not restrict myself to specific features, except Where specifically set foith in the ap ended claims.

What claim and desire to secure by Letters Patent is 1. A packing ring, comprising an open ring, the body of which is substantially rectangular in cross section, two projections of substantially the samelen h on diagonally opposite cornersof one en of said ring and forming two diagonally opposite recesses of substantiall the same size, and on diagonal y opposite-comers o the adjacent end of the rlng seated in said recesses, substantial]A as described.

2. A pa in ring, com rising an open Aring substantia y rectangu-arin cross section, .two diagonally opposite projections of projections v substantially the same length on one end of said ring, and two dia onally opposite projections of substantial y the same length as said IirSt-named projections on the adjacent end of said ring extending above and below said first-named projections, respectively,

substantially as described.

3. A packin ring, comprising a resilient open ring, the ody of which is substantially rectangular in cross section, two diagonally opposite non-communicating recesses of sub-v stantially equal size formed in one end of open ring substantially rectangular in cross section, two diagonally opposite projections on one end of said ring forming two diago nally opposlte non-communicating recesses, and two diagonallyA opposite projections formed on the other end of said ring forming two diagonally opposite non-communicating recesses, said projections being seated in said recesses, respectively.

In witness whereof, I have signed this specification in the presence of two subscribing witnesses.

EDWARD B. QAMPBELL. Witnesses:

' L. C. KINcsLAND, K. McDoNAnD. 

